As a young girl, Taryn Barker discovers a demonic subculture in Dublin, Ireland, lurking below the surface of society, when her baby sister is murdered. She is lured to a monstrous cult by a sinister man called Eskerin Falstaff, but is rescued by a gang of demon hunters. Taryn discover she has new superpowers and uses them to join the demon hunters tracking down Falstaff. As the city is plagued by a series of occult murders, Taryn teams up with a detective whose daughter has been kidnapped by Falstaff and together they embark on a treacherous path of revenge and redemption, to rid the city of the demonic forces that threaten its existence.